user
Explain why whales and dolphins belong to the order Cetartiodactyla


assistant
Whales and dolphins belong to the order Cetartiodactyla because they share common traits, such as their body structure and bone structure, with other even-toed ungulates, both aquatic and terrestrial, that also belong to the order. This suggests that they are descended from a common ancestor and form a single group within the order Cetartiodactyla.